Update paper.md

[xuanxu]

Re: openjournals/joss-reviews#6035

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (joss@8d82d3c). Click here to learn what that means.

❗ Current head bf465f4 differs from pull request most recent head dd110c3. Consider uploading reports for the commit dd110c3 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             joss     #189   +/-   ##
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  Coverage        ?   85.05%           
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  Files           ?        9           
  Lines           ?      649           
  Branches        ?        0           
=======================================
  Hits            ?      552           
  Misses          ?       97           
  Partials        ?        0           

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[musoke]

thank you!